package com.lrh.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.lrh.reggie.common.BaseContext;
import com.lrh.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*
 *检查用户是否已经完成登录
 * 拦截器 实现doFilter方法
 * 需要在启动类添加 @ServletComponentScan注解 才能扫描到 @WebFilter 才能创建拦截器
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求：{}", requestURI);


        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //4-1、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登陆，用户ID为：{}", request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        //4-2、判断移动端登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登陆，用户ID为：{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登陆");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
//        // 响应拦截器    /backend/js/request.js
//        service.interceptors.response.use(res => {
//        if (res.data.code === 0 && res.data.msg === 'NOTLOGIN') {// 返回登录页面
//            console.log('---/backend/page/login/login.html---')
//            localStorage.removeItem('userInfo')
//            window.top.location.href = '/backend/page/login/login.html' //跳转
//        } else {
//            return res.data
//        }
//    },
        //根据if (res.data.code === 0 && res.data.msg === 'NOTLOGIN') { 写返回错误的信息
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

//        log.info("拦截到请求：{}", request.getRequestURI());
//        filterChain.doFilter(request,response);
    }

    /*
    路径匹配，检查本次请求是否需要放行
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
